A long-haul truck driver pleaded not guilty Monday to charges he sexually abused his teenage stepdaughters and fathered one girl's baby.

Tony Slone, 43, entered the plea in Superior Court in Victorville, said Susan Mickey, a spokeswoman for the San Bernardino County district attorney's office.

Slone was charged with sexually abusing his now 13- and 16-year old stepdaughters over the last four years. His wife was charged with child abuse for allegedly letting her elder daughter continue to have contact with Slone after he fathered her 13-month-old child.

Tony Slone was arrested June 4 in Chester, N.Y., where he had traveled for work, and was extradited to California on Sunday. He is a registered sex offender and previously served an eight year-prison sentence for lewd acts with a child.

Prosecutors say they learned of the abuse when a high school student reported reading sexual text messages on her friend's cell phone from her friend's stepfather.

Mickey said an attorney from the conflict panel was appointed for Slone. No one at the panel's offices was immediately available to comment. Slone's next court date is June 30.

Anita Slone, 47, reached a plea deal with prosecutors last week. She pleaded guilty in exchange for no more than 180 days in county jail and five years probation, said Kathleen DiDonato, a deputy district attorney.

DiDonato said the probation would help protect the daughters until they are adults. Anita Slone is scheduled to be sentenced in July.